144289687 has 4 divisors (see below), whose sum is σ = 144503496. Its totient is φ = 144075880.

The previous prime is 144289681. The next prime is 144289721. The reversal of 144289687 is 786982441.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 144289687 - 2²³ = 135901079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144289687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144289681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105889 + ... + 107242.

It is an arithmetic number, because the mean of its divisors is an integer number (36125874).

Almost surely, 2^144289687 is an apocalyptic number.

144289687 is a deficient number, since it is larger than the sum of its proper divisors (213809).

144289687 is an equidigital number, since it uses as much as digits as its factorization.

144289687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213808.

The product of its digits is 774144, while the sum is 49.

The square root of 144289687 is about 12012.0642272675. The cubic root of 144289687 is about 524.4995224464.

The spelling of 144289687 in words is "one hundred forty-four million, two hundred eighty-nine thousand, six hundred eighty-seven".